So....I guess no one knows how to answer this question, Monstaman. Maybe try explaining your question a little better. I'm not exactly sure myself what you are asking: "parallel length of the fork tube machining" ? ? ?

Help us understand what you are wanting to know more specifically.

HF

If I understand what he is trying to say is, how far can you raise the fork in the triple clamps. The forks have a wasp like shape below the upper clamps. When mounted according to BMW specs, there is about 18mm below the upper clamp before the fork tube narrows. You can go higher but the top clamp will not have full contact.